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#!/bin/sh
#
# a simple script to check, if there was smb traffic since the last test
#
# you may want to adjust the function "filter_ipt_rules" according to your setup
#
# any Parameter are ignored
#
# this script has to run as root - as it invokes iptables
#
# possible deployment in crontab:
# smb_timeout.sh && (/etc/init.d/samba stop; umount /mnt/crypto)
#
# the iptables rules you need to detect smb traffic could look like the following:
# iptables -A INPUT -i eth0 -p udp --dport 138 -j ACCEPT
# iptables -A INPUT -i eth0 -p tcp --dport 139 -j ACCEPT
#
# called by:
# - TODO: this script is not in use, yet
#
set -eu
# parse config file
. /etc/cryptobox/cryptobox.conf
filter_ipt_rules()
# get the input rules for smb datagram traffic
{
iptables -L INPUT -vnx | grep -E "tcp upt:138|udp dpt:139"
}
function count_traffic()
{
local sum=0
# fallback if no rules were found
echo "$sum"
# extract the number of packets and calculate the sum
filter_ipt_rules | sed 's/ */ /g' | cut -d " " -f 3 | while read a
do sum=$((sum+a))
echo "$sum"
done | tail -1
# sorry for the echo-tail-voodoo - i did not know it better :)
iptables -Z INPUT
}
# config test
[ -z "`filter_ipt_rules`" ] && echo "[`basename $0`]: Could not find a matching iptables rule!" >&2 && exit 1
# return true if it was idle
test "`count_traffic`" -eq 0
exit $?